make use of python's presence in path

ci/templates/cloud-foundry-uaac-job.yaml

@@ -51,7 +51,7 @@ jobs:
   - bash: ./behave.sh ${{parameters.feature}}/src/${{parameters.sample}} ${{parameters.behave_args}} --tags ~@net461
     displayName: 'Sample -> ${{parameters.feature}}: ${{parameters.sample}}'
     env:
-      PYTHON: C:\hostedtoolcache\windows\Python\3.7.8\x64\python.exe
+      PYTHON: python
   - template: publish-results-steps.yaml
     parameters:
       feature: ${{parameters.feature}}